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Can You Mix High Mileage Oil With Regular Oil?: Know Today! 

Engine oil is always a matter of concern to the users. The heart of a car is the engine; taking good care of the engine long your car’s life. Changing engine oil is a must to do the job as a car owner. But you can have some questions about the best uses of engine oil. A certain type of engine oil is required by almost every type of engine or automobile model.

There are variants of each type, like, high mileage engine oil or regular engine oil. If you think that can you mix high mileage oil with regular oil? Yes, you can combine the two. It causes no harm to your vehicle.

High Mileage Oil And Regular Oil

What is high mileage oil? 

High-mileage oil is like a multivitamin for a car. It helps your engine to restore worn engine parts. High mileage oil is required for vehicles with more than 75,000 miles of driving. It reduces oil consumption, smoke, and emission from the older engines. Mainly high mileage vehicles can face a lot of problems. High mileage oil is like a cure for them. But it’s not like you need to use this kind of oil only in a high mileage car. 

You can also use it for your less than 75,000 miles car, which will not harm your car. So, in short words, engine oil that is used for high mileage cars like more than 75,000 miles is called high mileage oil. 

Benefits of High Mileage Oil

High mileage oil is a magical fluid for the car. It has many abilities to help your car to drive more days. After a long mileage, your engine can start to break down. A high mileage car helps to recover the decayed engine parts. It stops the engine parts from decaying. Old engines used to create a lot of sludge. 

As a result, high mileage oil helps to alleviate this problem. It decomposes and dissolves any remaining sludge in the system. Older engine starts to decay. Perfect and smooth lubrication is required to stop this process. High mileage oil is an effective remedy in this situation. It ensures proper lubrication in order to prevent deterioration.

An old engine usually burns more oil than a new one. Degraded engine seals cause problems burning gas completely. That’s why it makes waste of oil and a lot of smoke. High mileage oils rejuvenate degraded engine seals. It helps to burn the fuel completely. 

Because of this, it has an effect on fuel efficiency. There are several advantages to utilizing high mileage oil. You definitely should use high mileage oil after your 75,000 miles of driving.

When should I switch to high mileage oil?

There are some simple signs to notice. If you notice them, it’s time to switch to high mileage oil.

  • If you find that you have already crossed more than 75,000 miles.
  • If you see engine oil on the ground near where you parking your car.
  • If you find oil streaks under the lower engine parts.
  • If your car sounds louder than usual time.

These signs can inform you should move to high-mileage oil. Oil drippings signify that engine components are loosening. That means your engine has started to decay, and you should use high mileage oil now.

What is regular oil?

Regular oil is the oil we usually use as engine oil. It can be petroleum oil or synthetic. However, primarily regular petroleum oil is made from crude oil. Refined crude oil is used as regular engine oil. It’s also called mineral oil. 

There are artificial synthetic oil brands also available in the market. For long use, synthetic oil is better than mineral oil. We can call both of them regular oil here. The oil we usually use for the engine is regular.

Difference between high mileage oil and Regular oil:

High mileage oil is designed for engines of over 75,000 miles. The main focus of high mileage oil is to restore the engine parts from decaying. It contains some unique compounds to take care of the old engines and seal the swells. This type of oil is durable and won’t lose its viscosity too early. The synthetic base boosts the engine capacity while assuring the proper lubrication. Up to 15,000 miles, high mileage oil can be used.

Regular oil is used to lubricate the engine. It’s the basic job to do. Regular oil also helps with protecting the engine parts from decaying. Regular oils allow around 3,000 miles, and some synthetic oils allow around 6,000 to 7,000 miles. Regular oil cannot provide boosted engine performance like high mileage oil. Regular oil is not so expensive, but high mileage oil is more expensive than regular oil.

Can you mix high mileage oil with regular oil?

The answer to this question is yes. High mileage oil can run with regular oil without any problem. Even that won’t make any problem for the engine. However, it is preferable if you don’t not make this a habit. Before combining high mileage oil with ordinary oil, keep the following points in mind.

  • Manual from the manufacturer

They always provide a manual with the car. The manual describes and mentions which type of oil is needed. Using the wrong engine oil can make you suffer in the long run.

  • Impact on performance

There is no surety that mixing high mileage oil with regular oil can impact performance. It can end up acting like all the engine oil like regular oil. Then it’ll be a total waste of money.

  • Cost

If your mixed oil starts to act like regular oil, it will waste money. It can lose the benefits of the expensive one. 

Is mixing high mileage oil with regular oil harmful for the engine?

Well, it will not do any harm quickly. It won’t achieve anything serious in the short term. But using this kind of mixture for a long time can lead to some complex problems. You can certainly accomplish it if you really want to. But there is no guarantee that your mixture won’t harm your engine in the long run. It’s safe for the short run.


The article discussed mixing high mileage oil with regular oil. High mileage oil is beneficial. It’s a very common question. Can you mix high mileage oil with regular oil? There is no problem mixing this oil for the short run. But this habit can make difficulties for an extended period. So, the smartest way would be to avoid using it before that time.

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